Seems like an afterthought
The reason that Apple's M1 developer kits are decent is because Apple is wholeheartedly behind M1. They fully understand what it is, why the market wants it, and are committed to it. They've communicated this well to the world.
It seems in this case Microsoft are doing their usual thing of having no real clue of where things are heading. Putting out 1 piece of sub-standard hardware on only their US site shows this. It's not something they believe is "the future". Then again, they never really understood how The Internet would be the future, as demonstrated by their countless failings from Online Services in Windows 95 onwards.
This story to me isn't really about the hardware, it's about Microsoft's classic half-arsed approach when they're clueless about the future of something... something in this case which could possibly have a very big future for everyone else.
It made me laugh when somebody above posted "Second hand 950xl hardware is easy to find on eBay.". No shit it's easy to find. Another afterthought (Windows + mobiles = fail). Nobody wanted it, that's why!